Fig. 5
Mean and standard error of the spread per season (a) and period of the day (b) of a free-ranging cattle herd (N = 11) during eight trials of 3 weeks from September 2007 to August 2008. Periods of the day were selected as follows: (1) early morning, the first 3 h after sunrise; (2) midday, the 3 h around solar noon; (3) late afternoon, the last 3 h before sunset; and (4) midnight, the 3 h opposite from solar noon. Different letters above the bars indicate significant difference (P < 0.01)